Gear accuracy: JIS B 1702-1 (ISO) Grade 7 Number of teeth: 70 Shape: B1 Standard circle diameter (mm): φ175 Tooth width (mm): 25 Hole diameter (mm): 20 Module: 2.5 Tip circle diameter: φ180 Total length (mm):45 集线器外径(mm):φ125 总长度L:45 牙齿尖端圆形直径(mm):φ180 集线器长度(mm):20